Quote:
Originally Posted by JockoT
A turbo uses exhaust energy to drive it. The f1 turbos also have a motor generator which, when the turbo is being driven hard, harvests electricity for their DRS. .
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This is the key aspect for fuel economy. No more waste gate. No more waste. Maximum energy in harvested from the exhaust gas at all times. Except when there is no exhaust gas. ie when first getting back on it out of a corner. Then the motor in the turbo is driven for a second to become an electric supercharger until the exhaust gas flow comes back to take over. Having the motor in the turbo is a big net gain in harvested energy on average.